Axial Members under loading (cont)

In a Nut Shell: Frequent terms applying to axial members under loading include

K for “stiffness” of the member and f to designate the “flexibility” of the member.

The table below provides definitions of these terms.

K = stiffness of axial member	K = AE/L	P = K d
F = flexibility of axial member	f = L/AE	d = f P

Definition of terms:

Units

K =stiffness of member	N/mm, N/m, lb/inch, lb/ft
f = stiffness of member	mm/N, m/N, inch/lb, ft/lb
A = X-sectional area of member	mm^2, m^2, inch^2, ft^2
E = modulus of elasticity	N/mm^2, N/m^2, lb/inch^2, lb/ft^2
L = length of member	mm, m, inch, ft
P = axial force	N, kN, lb, Kips
d = axial deflection	mm, m, inch , ft

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